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(triggers: **\u002F*.service.ts, **\u002Fsearch\u002F**, Elasticsearch, CQRS, Synchronization)","ComeOnOliver\u002Fskillshub","ComeOnOliver","https:\u002F\u002Favatars.githubusercontent.com\u002Fu\u002F43215937?v=4","01M6E5JNFECJAAVFE0W7SMWWD2","Haoran Shu","01M6E5JNNDQS7AJZDYFQ8TPZCK",67,"MIT","https:\u002F\u002Fgithub.com\u002FComeOnOliver\u002Fskillshub\u002Fblob\u002Fmain\u002Fskills\u002FHoangNguyen0403\u002Fagent-skills-standard\u002Fnestjs-search\u002FSKILL.md",[],[19,20,21,22,23,24,25,26,27,28,29,30,31],"search","nestjs","nestjs search","sync","index","integration","elasticsearch","synchronization","use","patterns","cqrs","service","triggers","2026-11-10 10:12:30",false,"---\nname: nestjs-search\ndescription: \"Elasticsearch integration and Sync patterns. Use when integrating Elasticsearch or implementing search index sync in NestJS. (triggers: **\u002F*.service.ts, **\u002Fsearch\u002F**, Elasticsearch, CQRS, Synchronization)\"\n---\n\n# Search Engine & Full-Text\n\n## **Priority: P1 (OPERATIONAL)**\n\nFull-text search implementation with Elasticsearch and database patterns.\n\n- **Pattern**: **CQRS (Command Query Responsibility Segregation)**.\n  - **Write**: To Primary Database (Postgres\u002FMySQL). Source of Truth.\n  - **Read (Complex)**: To Search Engine (Elasticsearch, OpenSearch, MeiliSearch). Optimized for filtering, fuzzy search, and aggregation.\n\n## Synchronization (The Hard Part)\n\n- **Dual Write (Anti-Pattern)**: `await db.save(); await es.index();`.\n  - _Why_: Partial failures leave data inconsistent. Slows down HTTP response.\n- **Event-Driven (Recommended)**:\n  1. Service writes to DB.\n  2. Service emits `EntityUpdated`.\n  3. Event Handler (Async) pushes to Queue (BullMQ).\n  4. Worker indexes document to Search Engine with retries.\n- **CDC (Golden Standard)**: Change Data Capture (Debezium). Connects directly to DB transaction log. No app conceptual overhead, but higher ops complexity.\n\n## Organization\n\n- **Module**: Encapsulate the client in a `SearchModule`.\n- **Abstraction**: Create generic `SearchService\u003CT>` helpers.\n  - `indexDocument(id, body)`\n  - `search(query, filters)`\n- **Mapping**: Use `class-transformer` to map Entities to \"Search Documents\". Search docs should be flatter than Relational entities constraints.\n\n## Testing\n\n- **E2E**: Do not mock the search engine in critical E2E flows.\n- **Docker**: Spin up `elasticsearch:8` container in the test harness to verify indexing works.\n\n\n## Anti-Patterns\n\n- **No dual writes to DB + ES**: Use event-driven or CDC pattern; dual writes risk partial failure inconsistency.\n- **No Elasticsearch for structured queries**: Use DB indexes for filtering; ES is for full-text and complex search.\n- **No ES mocks in E2E search tests**: Spin up `elasticsearch:8` container to verify indexing behavior accurately.\n\n","# Search Engine & Full-Text\n\n## **Priority: P1 (OPERATIONAL)**\n\nFull-text search implementation with Elasticsearch and database patterns.\n\n- **Pattern**: **CQRS (Command Query Responsibility Segregation)**.\n  - **Write**: To Primary Database (Postgres\u002FMySQL). Source of Truth.\n  - **Read (Complex)**: To Search Engine (Elasticsearch, OpenSearch, MeiliSearch). Optimized for filtering, fuzzy search, and aggregation.\n\n## Synchronization (The Hard Part)\n\n- **Dual Write (Anti-Pattern)**: `await db.save(); await es.index();`.\n  - _Why_: Partial failures leave data inconsistent. Slows down HTTP response.\n- **Event-Driven (Recommended)**:\n  1. Service writes to DB.\n  2. Service emits `EntityUpdated`.\n  3. Event Handler (Async) pushes to Queue (BullMQ).\n  4. Worker indexes document to Search Engine with retries.\n- **CDC (Golden Standard)**: Change Data Capture (Debezium). Connects directly to DB transaction log. No app conceptual overhead, but higher ops complexity.\n\n## Organization\n\n- **Module**: Encapsulate the client in a `SearchModule`.\n- **Abstraction**: Create generic `SearchService\u003CT>` helpers.\n  - `indexDocument(id, body)`\n  - `search(query, filters)`\n- **Mapping**: Use `class-transformer` to map Entities to \"Search Documents\". Search docs should be flatter than Relational entities constraints.\n\n## Testing\n\n- **E2E**: Do not mock the search engine in critical E2E flows.\n- **Docker**: Spin up `elasticsearch:8` container in the test harness to verify indexing works.\n\n\n## Anti-Patterns\n\n- **No dual writes to DB + ES**: Use event-driven or CDC pattern; dual writes risk partial failure inconsistency.\n- **No Elasticsearch for structured queries**: Use DB indexes for filtering; ES is for full-text and complex search.\n- **No ES mocks in E2E search tests**: Spin up `elasticsearch:8` container to verify indexing behavior accurately.\n\n",{"name":5,"description":7},"main","def8531e65114c0fca8fb8551c1871ee0eed705c","skills\u002FHoangNguyen0403\u002Fagent-skills-standard\u002Fnestjs-search",24,"https:\u002F\u002Fgithub.com\u002FComeOnOliver\u002Fskillshub","https:\u002F\u002Fskillshub.wtf","https:\u002F\u002Fgithub.com\u002FComeOnOliver","AI & Blockchain Engineer\r\n","2026-06-24 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